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1999 S70NA Evita ECM-720A (P0630 P0645 pend)

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

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abscate
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abscate

1999 S70NA Evita ECM-720A (P0630 P0645 pend)

Post by abscate » Fri Apr 26, 2019 8:28 am

I had trouble getting keys made for Evita, so I did the tape the key to the Immob ring under dash, and have three keys cut and unshipped to run car.

The starting has always been a bit strange
First crank starts and then does the immob stall 2 seconds later.
Wait three seconds, cranks and starts fine.

I managed to get some understanding on this today.

I detected ECM-720A IMMOB fault, and when I cleared it, the car starts first time. Reading the webs, it seems like leaving the key in too long will pop a ECM-720A, but no CEL, (a P0630 or P0645 pends but I don't see those)

The next question is, How long is too long for the Key?

I could rig up the ring with a relay that closes on Term 15 to stop this of course.

:D :D :D


ECM-720A

ECM-720A IMMOBILIZER COMMUNICATION
DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION

Condition
This diagnostic trouble code (DTC) indicates that the configuration between the engine control module (ECM) and the immobilizer does not correspond.
The immobilizer transmits the VIN code to the engine control module (ECM) at start attempt. Diagnostic trouble code (DTC) ECM-720A is stored in the engine control module (ECM) if the engine control module (ECM) interprets the code as faulty or missing. The engine control module (ECM) will not allow the engine to be started.

Condition
none

Possible source

Faulty signal:
an engine control module (ECM) that does not correspond to the immobilizer code has been installed
an immobilizer that does not correspond to the engine control module (ECM) code has been installed
defective immobilizer
defective engine control module (ECM)
open-circuit in the communication between the immobilizer and engine control module (ECM).
Condition
engine does not start
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
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abscate
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abscate

Re: 1999 S70NA Evita ECM-720A (P0630 P0645 pend)

Post by abscate » Wed May 27, 2020 4:53 am

Follow up, you get this code if you use the taped in key trick.

The ME7 immobilizer does not like the key to be near the immobilized antenna permanently
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
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scot850
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scot850

Re: 1999 S70NA Evita ECM-720A (P0630 P0645 pend)

Post by scot850 » Wed May 27, 2020 8:14 am

I have a taped key under the dash for the remote start. It has been there for about 7 years now on the 2000 R

Neil
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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abscate
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Posts: 21041
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abscate

Re: 1999 S70NA Evita ECM-720A (P0630 P0645 pend)

Post by abscate » Wed May 27, 2020 8:24 am

Have you checked for a pending code or is it clear?

Just realized I’m running DENSO on this car, not ME7
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
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Re: 1999 S70NA Evita ECM-720A (P0630 P0645 pend)

Post by bmdubya1198 » Wed May 27, 2020 9:09 am

Maybe Denso is more picky than ME7. Weird.
2000 V70R Venetian Red/Charcoal M56 Swapped 195k
2003 S60 2.4T Silver/Black 112k
2007 XC90 V8 AWD Sport Titanium Grey/Black 166k
1991 944 Turbo Dark Green/Beige 173k
1992 245 Base White/Beige 249k
2006 BMW 330i
1999 BMW 528i
Sold-
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
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scot850
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Re: 1999 S70NA Evita ECM-720A (P0630 P0645 pend)

Post by scot850 » Wed May 27, 2020 10:46 am

Have not checked it, but the car has shown no issues, other than if I turn the key to II and then wait a couple of seconds it fires up straight away. When I get the battery back in I will try to check for you if there is any codes.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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